How can i paint some pixels in grayscale image to non-gray colors?

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Tzvi
Tzvi 2012-12-11
评论： Walter Roberson 2018-4-7
I have a Grayscale images I want to paint some pixels pixels that i choose in red for example. How can i do it?

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Walter Roberson
Walter Roberson 2012-12-11
You cannot paint some pixels a non-gray color but have it remain a grayscale image.
You can overlay a different image on top that is transparent except where you want the colored pixels, and have the color in that second image. The color would have to be specified as RGB.
You can convert the image from grayscale to RGB and then replace pixels in the new image. For example,
RGBimage = cat(3, GrayImage, GrayImage, GrayImage);
RGBimage(1:10, 1:10, 1) = 255;
RGBimage(1:10, 1:10, 2:3) = 0;
and then display RGBimage
  2 个评论
David
David 2018-4-5
I am using MRI data and need to highlight portions. Using cat completely distorted the image. Do you have another suggestion in how to fix this?
Walter Roberson
Walter Roberson 2018-4-7
I speculate that your MRI data is grayscale 3D, with the third dimension representing slices.
How are you displaying the data?

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